Amateur radio (also called ham radio) describes the use of radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communication.

Fred's Osterman Shortwave Receivers Catalog

I would like to thank Mr. Fred Osterman N8EKU for his gentle kindness to include me
among the contributors, in his new edition of shortwave Receivers. In
the 800 page Collection has 1700 Shortwave Communications Receivers
manufactured, from 370 Manufactures, in 40 countries, from 1942 - 2013.